CN107303603A - The mouth of a river - Google Patents
The mouth of a river Download PDFInfo
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- CN107303603A CN107303603A CN201611177022.0A CN201611177022A CN107303603A CN 107303603 A CN107303603 A CN 107303603A CN 201611177022 A CN201611177022 A CN 201611177022A CN 107303603 A CN107303603 A CN 107303603A
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- Prior art keywords
- mouth
- weight
- river
- molten steel
- fire proofing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/502—Connection arrangements; Sealing means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to a kind of mouth of a river, it is the casting nozzle with mouth of a river main body, the mouth of a river main body includes molten steel inner chamber movable within, and molten steel is sent to the discharging opening of lumen outer by it, wherein at least a portion of mouth of a river main body is comprising containing key component, (it includes perovskite (CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、2CaO·SiO2), diboron trioxide (B2O3) and graphite (C)) and adhesive the first fire proofing composition, and first fire proofing composition can form lower boiling material and suppress or prevent nozzle blocking by reacting with the field trash in molten steel.
Description
Technical field
The present invention relates to a kind of mouth of a river, more particularly, to it is a kind of can be by being reacted with the field trash in molten steel with shape
The mouth of a river blocked is prevented into the material of low melting point.
Background technology
Typical continuous casting process is by making the technique of molten steel solidification production slab, wherein during the molten steel in ladle is introduced into
Between wrap in, and the molten steel being introduced into tundish be introduced continuously into crystallizer and carries out once cooling (primary
Cooling after), secondary cooling is carried out by spraying cooling water in the steel slab surface through once cooling down.Herein, by
Between wrap in molten steel be fed to the process of crystallizer during, by (slip) mouth of a river (gate) installed in tundish exit or
Molten steel is incorporated into crystallizer by stopper (stopper) to adjust the discharge of molten steel by the immersion mouth of a river.
Aluminum oxide (Al2O3) type field trash is present in molten steel, and the fine foreign matter not removed by flotation is attached to
Connect the inwall and discharging opening at the immersion mouth of a river of tundish and crystallizer, therefore the source as immersion nozzle blocking.It is logical
Often, in order to overcome this problem, such method is used：For example, by the inwall supplying inert gas to the immersion mouth of a river such as
Argon (Ar) etc. suppresses attachment of the field trash on the inwall to form bubble (field trash is captured by it), or passes through
The inner lumen materials comprising calcium oxide (CaO) are set to form aluminum oxide (Al on the inwall at the immersion mouth of a river2O3) and low-melting-point material
Matter removes the field trash of attachment.However, in the former case, field trash is reduced in submergence although having to a certain extent
The effect adhered on the inwall at the formula mouth of a river, but the suppression of the attachment of field trash is limited to cold for example as caused by inert gas
But act on.
Meanwhile, latter event is used as suppressing the most efficient method that field trash adheres on the inwall at the immersion mouth of a river
One of.For the chamber containing calcium oxide (CaO), usually using calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、2CaOSiO2)
With graphite (C).The calcium oxide (CaO) that is attached by for example following material and aluminum oxide of the field trash under casting temperature
(Al2O3) between reaction be inhibited.
Formula 1) CaOSiO2→CaO+SiO2
Formula 2) 2CaOSiO2→2CaO+SiO2
Formula 3) 12CaO+7Al2O3→12CaO7Al2O3
However, setting in molten steel in a crystallizer and considering with the state that submerges due to the discharging opening at the immersion mouth of a river
Contain a small amount of CaO to the stability at the immersion mouth of a river, low melting point (12CaO7Al can be formed2O3) CaO amount not
Foot, therefore form high-melting-point substances such as CaO2Al2O3And CaO7Al2O3.Therefore, field trash is adversely accelerated on discharging opening
Attachment.Especially, when field trash is exceedingly attached on the discharging opening at the immersion mouth of a river, there is such limitation：By steel
Water produces groove during introducing crystallizer so that the quality deterioration of slab.Therefore, in order to improve the quality of steel, it is necessary to a kind of energy
Enough methods for fundamentally preventing that field trash is attached on the discharging opening at the immersion mouth of a river.
Therefore it has already been proposed that CaO content in discharging opening by increasing the immersion mouth of a river is to cause in discharging opening
Form low melting point 12CaO7Al2O3To prevent nozzle blocking.However, when the CaO content in the discharging opening at the immersion mouth of a river
During increase, immersion intake variable must be sensitive to aquation, and therefore, it is difficult to keep.Further, since the engineering properties of refractory material
Deterioration so that there is the problem of being damaged for example during casting, therefore exist in terms of the immersion mouth of a river is reliably used
Limitation.
Prior art literature
Patent document
(patent document 1) KR1597254B
The content of the invention
The invention provides a kind of mouth of a river, it can be by forming during casting with the field trash reaction in molten steel
Low melting point come suppress block.
According to an exemplary, casting nozzle has mouth of a river main body：The mouth of a river main body includes molten steel wherein
Mobile inner chamber；And molten steel is sent to the discharging opening of lumen outer by it, wherein mouth of a river main body includes upper body, and it is limited
Molten steel inner chamber movable within is determined；Sub-body, it is arranged on below upper body, and with being formed at bottom master
Molten steel in body is sent to the discharging opening of lumen outer by it；And intermediate host, it is arranged on upper body and bottom master
Between body, and the flow path for making can be connected between inner chamber and discharging opening is defined, sub-body, which is included, contains main group
Divide the first fire proofing composition with adhesive, the key component includes perovskite (CaTiO3), calcium zirconate (CaZrO3), calcium silicates
(CaO·SiO2、2CaO·SiO2), diboron trioxide (B2O3) and graphite (C).
Upper body can be formed by the second fire proofing composition, and second fire proofing composition, which is included, contains aluminum oxide (Al2O3)
With the fire proofing composition of carbon (C) or contain aluminum oxide (Al2O3), silicate (SiO2) and the fire proofing composition of carbon (C) in extremely
Few one kind；And the first fire proofing composition and the mixture of the second fire proofing composition can be used to be formed for intermediate host.
The gross weight of mixture relative to 100 weight %, mixture can include 40 weight % to the first of 60 weight %
Fire proofing composition.
According to another exemplary, casting nozzle has：Mouth of a river main body, the mouth of a river main body includes molten steel at it
The inner chamber of middle movement and molten steel are sent to the discharging opening of lumen outer by it, wherein at least a portion of mouth of a river main body
The first liner for including the first fire proofing composition containing key component and adhesive is provided with, the key component includes perovskite
(CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、2CaO·SiO2), diboron trioxide (B2O3) and graphite (C).
First liner can be submerged on part at least formed at mouth of a river main body molten steel.
Slag line portion can be set on the periphery of mouth of a river main body；And can be in slag line portion the first liner formed below.
First liner is formed as 5mm to 15mm thickness.
The second liner comprising the first fire proofing composition can be set in the lumen.
Second liner is formed as 2mm to 8mm thickness.
First fire proofing composition can include 95 weight % to 99 weight % key component and 1 weight % to 5 weight %'s
Adhesive.
Key component can include 3 weight % to 25 weight % perovskite (CaTiO3), 28.5 weight % to 83.9 weights
Measure % calcium zirconate (CaZrO3), 3 weight % to 15 weight % calcium silicates (CaOSiO2、2CaO·SiO2), 0.01 weight
Measure % to 1.5 weight % diboron trioxide (B2O3) and 10 weight % to 30 weight % graphite (C).
Relative to 100 weight % key component, the mouth of a river can also include 3 weight % to 10 weight % silica
(SiO2)。
Adhesive may include thermosetting resin.
Brief description of the drawings
Fig. 1 is the schematic diagram for being shown in which to use the Casting Equipment at the mouth of a river according to an embodiment；
Fig. 2 is CaO-Al2O3Phasor；
Fig. 3 is the sectional view at the mouth of a river according to an embodiment；
Fig. 4 is the sectional view at the mouth of a river according to a modification；
Fig. 5 is the photo at the mouth of a river after casting is completed；And
Fig. 6 is the photo for showing the analysis result for casting the mouth of a river component after completing.
Embodiment
Hereinafter, specific embodiment is described in detail with reference to the accompanying drawings.However, the present invention can be real in different forms
Apply, and should not be construed as limited to the embodiment described herein.And be to provide these embodiments to cause in the disclosure
Appearance is thorough and complete, and fully passes on the scope of the present invention to those skilled in the art.In the description, identical
Reference is endowed identical feature.In the accompanying drawings, in order to clearly demonstrate, the size in some regions may be exaggerated, and
And identical reference refers to identical element.
First, when introducing by a variety of different hot melt materials or being fed to another container, it can be used according to one
The mouth of a river of individual embodiment.Here, giving the immersion mouth of a river for supplying molten steel from tundish to crystallizer during casting
Explanation.
Fig. 1 is the schematic diagram for being shown in which to use the Casting Equipment according to the mouth of a river of an embodiment, and Fig. 2 is
CaO-Al2O3Phasor；
Reference picture 1, Casting Equipment (such as continuous casting installation for casting) may include：Tundish 10, it, which has, stores and distributes from steel
The function of the molten steel 60 of bag, the ladle is the container for storing refined molten steel；Stopper 20 and sliding panel 30, it controls molten steel
60 flow；The immersion mouth of a river 40, molten steel 60 is discharged into crystallizer 50 by it；And crystallizer 50, it solidifies molten steel 60
And thus it is converted into slab 61.In Fig. 1, in order to control the flow of molten steel, show set stopper 20 and slide
Both plates 30, but in practical operation, one of stopper 20 or sliding panel 30 can be used.
The immersion mouth of a river 40 is connected to the bottom of tundish 10, and the molten steel in tundish 10 is incorporated into crystallizer 50
In.Herein, the bottom at the immersion mouth of a river 40 can be arranged in the molten steel that is immersed into crystallizer 50.During casting, wherein
The bottom for being formed with the immersion mouth of a river 40 of discharging opening is immersed into molten steel.Due to shape in the discharging opening that is discharged in molten steel by it
The region being detained into molten steel, compared with the inner chamber at the immersion mouth of a river 40 as molten steel transmitting path, a greater amount of field trashes can
It can be attached on discharging opening.That is, aluminum oxide (Al2O3) type field trash is present in molten steel, and not by flotation remove it is tiny
Field trash is attached to the inwall and discharging opening at the immersion mouth of a river 40, so as to cause nozzle blocking.Such fine foreign matter and group
Fire proofing composition into the immersion mouth of a river 40 reacts to form high-melting-point substances such as CaO2Al2O3.The high-melting-point substances being consequently formed
Inner chamber or the discharging opening at the immersion mouth of a river 40 can be attached directly to.
Therefore, in some embodiments, the fire resisting group of low melting point can be produced with the field trash reaction in molten steel
Compound can be included at least a portion at the immersion mouth of a river 40, to suppress or prevent field trash to be attached to the immersion mouth of a river 40
Inner chamber or discharging opening.
Can be included according at least a portion at the immersion mouth of a river 40 of an embodiment has key component and adhesive
Fire proofing composition, the key component include perovskite (CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、
2CaO·SiO2), diboron trioxide (B2O3) and graphite (C).Herein, relative to the gross weight of refractory assemblies, it can include
95 weight % to 99 weight % key component and 1 weight % to 5 weight % adhesive.
The each component included in fire proofing composition according to an embodiment is detected as follows.
[perovskite (CaTiO3)]：Key component relative to 100 weight % is 3 weight % to 25 weight %
By with the aluminum oxide (Al in molten steel2O3) react, perovskite can be used as producing low melting point 12CaO
7Al2O3Source.Reference picture 2, fusing point is about 1415 DEG C of 12CaO7Al2O3Fusing point less than fusing point be at least 1600 DEG C
High-melting-point substances CaO2Al2O3。
Under the high temperature such as temperature range of molten steel during casting, such as in formulas below 1, perovskite and fire proofing composition
In graphite (C) reaction, with produce be used for by with oxidation reactive aluminum and produce the CaO sources of low melting point.
(formula 1)
CaTiO3(s)+3C(s)→CaO(s)+TiC(s)+2CO(g)
Herein, although quick lime (CaO) can be directly used as producing the source of low melting point, but can be led using quick lime
Cause occur hydration reaction, so that the material property for changing the immersion mouth of a river 40 make it that stable casting is hindered.
The key component of composition fire proofing composition relative to 100 weight %, can include 3 weight % to 25 weight % calcium
Titanium ore.When perovskite content be less than given range when, it is not easy to by with the oxidation reactive aluminum in molten steel and produce low-melting-point material
Matter, and when higher than given range, resistance to sudden heating may be reduced so that the casting that can not be stablized.That is, when perovskite contains
When measuring excessive, it can cause to form big in the immersion mouth of a river 40 by reacting the CO gases produced with the graphite in fire proofing composition
The porous layer of amount so that the intensity decreases at the immersion mouth of a river 40.
[calcium zirconate (CaZrO3)]：Key component relative to 100 weight % is 28.5 weight % to 83.9 weight %
Calcium zirconate is used to be formed to improve the refractory material to the corrosion patience of slag, crystallizer protecting residue, molten steel etc.
The outward appearance at the immersion mouth of a river 40.In addition, calcium zirconate includes calcium oxide CaO sources, the oxidation in the calcium oxide CaO sources and molten steel
Form low melting point liquid phase substance when aluminum inclusion is contacted, thus can by increase the usage amount of calcium zirconate realize it is anti-with aluminum oxide
Favourable outcome in terms of answering property.
Relative to 100 weight % key component, 28.5 weight % to 83.9 weight % calcium zirconate can be included.Work as zirconic acid
When calcium content is less than given range, corrosion resistance may be reduced, and when higher than given range, resistance to sudden heating may be reduced.
Further, since calcium zirconate is relatively expensive, its excessive use can reduce business efficiency.
[calcium silicates (CaOSiO2、2CaO·SiO2)]：Key component relative to 100 weight % is 3 weight % to 15
Weight %
Calcium silicates promotes the CaO diffusions of calcium zirconate.In addition, calcium silicates includes CaO components in itself, therefore, can be with perovskite
Together with oxidation reactive aluminum, so that as the source for producing low melting point.
Relative to 100 weight % key component, the content of calcium silicates can be 3 weight % to 15 weight %.Work as calcium silicates
When content is less than given range, it may not allow to be also easy to produce low melting point, so as to occur nozzle blocking.When higher than given model
When enclosing, excessive solution produces the corrosion patience reduced to molten steel, and the content of other components is relatively high, therefore exists
Limitation to material property, for example, the resistance to sudden heating at the immersion mouth of a river 40 may be deteriorated.
[diboron trioxide (B2O3)]：Key component relative to 100 weight % is 0.01 weight % to 1.5 weight %
Diboron trioxide (B2O3) can be used as suppressing the stabilizer that calcium silicates is decomposed.Calcium silicates is at about 800 DEG C to 900 DEG C
Phase transformation is carried out, but can be by adding B2O3Suppress calcium silicates phase transformation.Relative to 100 weight % key component, B2O3Content
Can be 0.01 weight % to 1.5 weight %.Work as B2O3When content is less than given range, it may not be possible to effectively prevent calcium silicates from sending out
Raw phase transformation, and when higher than the given range, B2O3Graphite or anti-with calcium silicates contained in the immersion mouth of a river 40 may be aoxidized
Low melting point should be produced, therefore limitation can be produced, such as because the immersion mouth of a river 40 caused by thermal shock melts or is damaged.
[graphite]：Key component relative to 100 weight % is 10 weight % to 30 weight %
Graphite has the low degree of wetting to slag, crystallizer protecting residue, molten steel etc., and with high heat conductance.In addition, graphite
The degree of wetting of calcium zirconate is reduced, so that resistant to liquid permeability is enhanced, and available for the heat-resisting punching assigned to temperature change
Hitting property.Flake graphite etc. can be used as graphite, and the key component content of graphite relative to 100 weight % can be for 10 weight % extremely
30 weight %.When content of graphite is less than given range, may make the resistance to sudden heating at the immersion mouth of a river 40 reduces, and works as and be higher than
During given range, corrosion resistance may be because intensity lacks and dies down, and high heat conductance can increase thermal diffusion amount, so that significantly
Reduce molten iron temperature.
[adhesive]：Fire proofing composition relative to 100 weight % is 1 weight % to 5 weight %
Adhesive can be used for bonding said components, i.e. perovskite, calcium zirconate, calcium silicates, B2O3And graphite, so as to assign leaching
Do not have the formula mouth of a river 40 with mouldability.Adhesive may include phenolic resin, and can be used with many different forms, such as conduct
Liquid phase, solid phase etc..Relative to key component and the total amount of adhesive, binder content can be 1 weight % to 5 weight %.When viscous
When mixture content is less than given range, the bonding strength between component is low, therefore reduces mouldability, and when higher than given range
When, there is such limitation：Viscosity, which increases, causes mouldability reduction, and the compactness (packing) of fire proofing composition, which increases, to be caused
Porosity is reduced, and modulus of elasticity increases so that resistance to sudden heating reduction.
[silicate (SiO2)]：Fire proofing composition relative to 100 weight % is 3 weight % to 10 weight %, as remaining
Amount
, can also be comprising silicate as surplus in addition to key component and adhesive, and can be used for enhancing immersion
The resistance to sudden heating at the mouth of a river 40.Relative to 100 weight % fire proofing composition, 3 weight % to 10 weight % silicic acid can be included
Salt is used as surplus.When silicate content is less than given range, it is difficult to improve the resistance to sudden heating at the immersion mouth of a river 40, and when super
When crossing given range, there is the limitation of the material character to the immersion mouth of a river 40, for example, may change such as resistance to sudden heating, corrosion resistant
Corrosion etc..
It is formed as in its at least a portion including above-mentioned fire proofing composition according to the immersion mouth of a river of embodiment.It is resistance to
Fiery composition reacts to form low melting point with field trash contained in molten steel.Therefore, nozzle blocking can be by suppressing or preventing
Field trash is attached to the immersion mouth of a river and is inhibited.
Fig. 3 is the sectional view at the mouth of a river according to an embodiment, and Fig. 4 is the mouth of a river according to a modification
Sectional view.
Reference picture 3, the immersion mouth of a river 40 may include that the inner chamber 42 that molten steel is moved in and molten steel can be conveyed by it
To the discharging opening 42 of outside (such as crystallizer 50).
Mouth of a river main body 41 may include：Upper body 41a, it is connected with tundish 10 and defines that molten steel is moved in
Inner chamber 42；Sub-body 41c, it is arranged on upper body 41a lower section, and with being formed at the sub-body 41c
In discharging opening 45, the discharging opening 45 connects therefore the outside that enables molten steel to be sent to inner chamber 42 with inner chamber 42；And
Intermediate host 41b, it is arranged between upper body 41a and sub-body 41c, and is defined and made inner chamber 42 and discharging opening 45
Between the flow path 44 that can connect.
Upper body 41a and sub-body 41c are interconnected by intermediate host 41b.Therefore, in upper body 41a
Discharging opening 45 in inner chamber 42 and sub-body 41c can be interconnected by the flow path 44 in intermediate host 41b.Cause
This, the molten steel for being moved through inner chamber 42 can be discharged by flow path 44 via discharging opening 45.Hereinafter, main group will be included
Divide and the fire proofing composition of adhesive is referred to as the first fire proofing composition.
Upper body 41a can contain Al2O3- C or Al2O3-SiO2At least one of-C the second fire proofing composition.
The first liner 43 can be formed in upper body 41a inner chamber 42.First liner 43 can be by using the material formed in inner chamber 42
Expect to be formed, the material directly contacts molten steel, and produces low melting point with the field trash reaction in molten steel, and can wrap
Containing such as CaZrO3-CaO·SiO2The fire proofing compositions of-C or above-mentioned first, i.e., containing perovskite (CaTiO3), calcium zirconate
(CaZrO3), calcium silicates (CaSiO2), diboron trioxide (B2O3) and graphite (C) fire proofing composition.
In addition, slag line portion 47 can be formed in upper body 41a.Slag line portion 47 is improved to slag (or covering slag), steel
The construction of the corrosion resistance of water etc., and can the near surface of molten steel in a crystallizer formed.Slag line portion 47 can use a variety of
Different materials are formed, the mixture such as the partially stabilized zirconium oxide of calcia magnesia, graphite.
Sub-body 41c is the part being immersed into molten steel, therefore continuously contacted with molten steel.Sub-body 41c can be included
Low melting point such as 12CaO7Al is produced with the field trash reaction in molten steel2O3First chamber.That is, sub-body 41c can
Comprising containing perovskite (CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaSiO2), diboron trioxide (B2O3) and graphite (C)
First chamber.
In addition, working as upper body 41a is connected by compensating the difference of coefficient of thermal expansion caused by the difference by each component
, can be by making composition upper body 41a and sub-body 41c the second fire resisting in order to realize stability during with sub-body 41c
Composition and the first fire proofing composition mix to form intermediate host 41b.Herein, it is main in the middle of the composition relative to 100 weight %
Body 41b fire proofing composition, intermediate host 41b can be by making 40 weight % to 60 weight % the first fire proofing composition and 40 weights
Amount % to 60 weight % the second fire proofing composition mixes to be formed.Intermediate host 41b longitudinal length can be 15mm to 40mm.
The first liner 43 being formed in upper body 41a inner chamber 42 may extend into the flow path being formed in intermediate host 41b
44。
As described above, mouth of a river main body 41 may include upper body 41a, intermediate host 41b and sub-body 41c, but such as
Shown in Fig. 4, mouth of a river main body 41 may be alternatively formed to single main body.
In this case, mouth of a river main body 41 can include the second fire resisting for the upper body 41a for constituting the embodiment above
Composition.In addition, under bottom that can be at least into the molten steel being immersed into crystallizer 50 of mouth of a river main body 41 is set comprising constituting
Second liner 48 of portion main body 41c the first refractory material.The second liner 48 can be formed to cover the bottom of mouth of a river main body 41,
That is, the part in the molten steel of crystallizer 50 is immersed into, and thickness is 5mm to 15mm.Given when the thickness of the second liner 48 is less than
When determining scope, the CaO sources being contained in the second liner 48 are not enough, therefore can not be easy by being reacted with the field trash in molten steel
Ground produces low melting point.Further, since discharging opening 45 must at least have certain diameter to allow molten steel easily to discharge,
When the thickness of the second liner 48 is more than given range, the thickness of mouth of a river main body 41 must correspondingly reduce, and therefore, reduce
The intensity at the immersion mouth of a river 40 so that casting stability is adversely reduced.
Although the first liner 43 can be formed in inner chamber 42, the second liner 48 can only be formed at the bottom of mouth of a river main body 41,
But also may not include the first liner 43 and substituted with the second liner 48.Herein, in mouth of a river main body 41, the second liner 48 can be from
Inner chamber 42 extends, and outside mouth of a river main body 41, second mouth of a river 48 may extend into the underface in slag line portion 47.Second liner 48 can shape
As in inner chamber 42 and mouth of a river main body 41 bottom in have different thickness.The thickness of the second liner 48 in inner chamber 42 can
It is 2mm to 8mm, and the continuous transmission due to molten steel in inner chamber 42, thickness of the thickness than the bottom being immersed into molten steel
Degree is thin.
Hereinafter, the result that practical operation is applied to according to the mouth of a river of an embodiment is detected.
Fig. 5 be casting complete after the mouth of a river photo, Fig. 6 be show casting complete after mouth of a river component analysis result
Photo.
[comparing scheme]
There is provided the immersion mouth of a river, it contains Al2O3- C or Al2O3-SiO2At least one of-C the second fire resisting
Composition.Cast by using al-killed ultra-low-carbon steel (aluminum killed ultra low carbon steel)
After making, the reaction product for being attached to discharging opening is observed by cutting the discharging opening side at the immersion mouth of a river.
[embodiment]
There is provided the immersion mouth of a river with sub-body 41c, the sub-body 41c contains perovskite
(CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaSiO2), diboron trioxide (B2O3) and graphite (C) the first fire resistant composition
Thing.It is attached to observe by the discharging opening side for cutting the immersion mouth of a river after being cast by using al-killed ultra-low-carbon steel
The reaction product of discharging opening.
Fig. 5 (a) shows the section according to the immersion mouth of a river for comparing scheme.(a) of reference picture 5, by completing
The thickness for the reaction product adhered near the discharging opening that the immersion mouth of a river is measured after casting, it was observed that being attached to each discharging opening
The thickness of reaction product is 30mm, therefore gross thickness is thicker, is about 60mm.
Fig. 5 (b) shows the section at the immersion mouth of a river according to the present embodiment.It was observed that, after the casting, attachment
Thickness to the reaction product of each discharging opening is respectively 8mm and 10mm, and gross thickness is about 18mm.
As can be seen that being attached to the amount of the reaction product of the discharging opening at the immersion mouth of a river according to the present embodiment less than attached
The amount of the reaction product of discharging opening according to the immersion mouth of a river for comparing scheme.Recognize that this is due to the fact that：
According to the immersion mouth of a river of scheme is compared, in discharging opening of the high-melting-point substances formed during casting at the immersion mouth of a river
Accumulation, so as to form the reaction product layer of thickness, and in the immersion mouth of a river according to the present embodiment, is formed during casting
A part for low melting point is attached to discharging opening, and another part is incorporated into molten steel, therefore forms the reaction of relative thin
Product layer.
Fig. 6 is the photo of the analysis result for the discharging opening component for showing the immersion mouth of a river.
Fig. 6 (a) is the analysis result according to discharging opening component in the immersion mouth of a river for comparing scheme, and Fig. 6 (b)
It is the analysis result of discharging opening component in the immersion mouth of a river according to the present embodiment.Herein, show exist from blueness to red
A greater amount of respective components.
First, detect Fig. 6 (a), according in the immersion mouth of a river for comparing scheme observe flame retardant coating/conversion zone/folder
The structure of debris layer.Herein, substantial amounts of aluminium (Al) component and less amount of calcium (Ca) component are observed in a reactive layer.
Fig. 6 (b) is detected, flame retardant coating/porous layer/conversion zone is observed in the immersion mouth of a river according to the present embodiment
The structure of (Ca enriched layers)/reaction product layer (being mingled with nitride layer).It is different from comparing scheme, reaction is observed in the present embodiment
Layer (Ca enriched layers) and reaction product layer (being mingled with nitride layer).It is different from comparing scheme, in the present embodiment, be mingled with nitride layer and
The Ca components more a greater amount of than Al component are observed in both conversion zones, and it was observed that more relative than Al component in Ca enriched layers
A greater amount of Ca components.It is assumed that because, in the immersion mouth of a river according to the present embodiment, the addition of perovskite result in
Low melting point can be formed with the addition in calcium oxide (CaO) source of inclusion content in melting steel reaction.In addition, with according to the side of being compared
The immersion mouth of a river of case is different, and porous layer is observed in the immersion mouth of a river according to the present embodiment.It can be assumed that from calcium
The source CaO for being used to produce low melting point of titanium ore is produced by the reaction as described in above formula 1, the calcium titanium in the reaction
Ti in ore deposit produces CO with graphite (C) reaction.
By such result it has been confirmed that the type and group of the fire proofing composition by changing the composition immersion mouth of a river
Point, by being reacted with field trash low melting point can be produced during casting, so as to suppress or prevent nozzle blocking.
According to some embodiments, such as the inner chamber using the immersion mouth of a river or discharging opening in casting process, the mouth of a river
Blocking can be suppressed or be prevented.That is, pass through and form such mouth of a river so that at least a portion at the mouth of a river include with molten steel
Field trash reaction produces the fire proofing composition of low melting point, can suppress or prevent from reacting with field trash during casting to produce
Reaction product be attached on the mouth of a river.Therefore, by suppress or prevent due to during casting by anti-with inclusion content in melting steel
The blocking of inner chamber or discharging opening caused by reaction product, the casting that can be stablized formed by answering.In addition, the life-span at the mouth of a river
It can be extended, to reduce loss in productivity or cost as caused by changing the mouth of a river.
Although the mouth of a river has been described with reference to specific embodiments, mouth of a river not limited to this.Therefore, people in the art
Member will readily appreciate that, in the case of without departing substantially from the spirit and scope of the present invention being defined by the following claims, can be to this
Invention carries out various modifications and changes.
Claims (13)
1. a kind of casting nozzle, including mouth of a river main body, the mouth of a river main body include molten steel inner chamber movable within and described
Molten steel by its be sent to the inner chamber outside discharging opening,
Wherein described mouth of a river main body includes,
Upper body, which defines the molten steel inner chamber movable within,
Sub-body, it is arranged on below the upper body, and with the molten steel being formed in the sub-body
By the discharging opening of its outside for being sent to the inner chamber, and
Intermediate host, it is arranged between the upper body and the sub-body, and is defined and made the inner chamber and institute
The flow path that can be connected between discharging opening is stated, the sub-body includes the first fire resisting containing key component and adhesive
Composition, the key component includes perovskite (CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、2CaO·
SiO2), diboron trioxide (B2O3) and graphite (C).
2. the mouth of a river according to claim 1, wherein：
The upper body is formed by the second fire proofing composition, and second fire proofing composition, which is included, contains aluminum oxide (Al2O3) and
The fire proofing composition of carbon (C) contains aluminum oxide (Al2O3), silicate (SiO2) and the fire proofing composition of carbon (C) at least
It is a kind of；And
The intermediate host is formed using the mixture of first fire proofing composition and second fire proofing composition.
3. the mouth of a river according to claim 2, wherein the gross weight of the mixture relative to 100 weight %, described mixed
Compound includes 40 weight % to 60 weight % first fire proofing composition.
4. a kind of casting nozzle, including mouth of a river main body, the mouth of a river main body include molten steel inner chamber movable within and described
Molten steel by its be sent to the inner chamber outside discharging opening, wherein being provided with bag at least a portion of the mouth of a river main body
Containing the first liner containing key component and the first fire proofing composition of adhesive, the key component includes perovskite
(CaTiO3), calcium zirconate (CaZrO3), calcium silicates (CaOSiO2、2CaO·SiO2), diboron trioxide (B2O3) and graphite (C).
5. the mouth of a river according to claim 4, wherein first liner soaks at least formed at the molten steel of the mouth of a river main body
Do not have on part.
6. the mouth of a river according to claim 4, wherein：
Slag line portion is provided with the periphery of the mouth of a river main body；And
The first liner formation is below the slag line portion.
7. the mouth of a river according to claim 4, wherein first liner is formed as the thickness with 5mm to 15mm.
8. the mouth of a river according to claim 1 or 2, wherein being provided with the inner chamber comprising first fire proofing composition
The second liner.
9. the mouth of a river according to claim 8, wherein second liner is formed as the thickness with 2mm to 8mm.
10. the mouth of a river according to any one of claim 1 to 7, wherein first fire proofing composition includes 95 weight %
To 99 weight % the key component and 1 weight % to 5 weight % described adhesive.
11. the mouth of a river according to claim 10, wherein the key component includes 3 weight % to 25 weight % perovskite
(CaTiO3), 28.5 weight % to 83.9 weight % calcium zirconate (CaZrO3), 3 weight % to 15 weight % calcium silicates
(CaO·SiO2、2CaO·SiO2), 0.01 weight % to 1.5 weight % diboron trioxide (B2O3) and 10 weight % to 30 weights
Measure % graphite (C).
12. the mouth of a river according to claim 11, relative to the 100 weight % key component, also comprising 3 weight % extremely
10 weight % silicate (SiO2)。
13. the mouth of a river according to claim 12, wherein described adhesive include thermosetting resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0048197 | 2016-04-20 | ||
| KR1020160048197A KR20170119917A (en) | 2016-04-20 | 2016-04-20 | A nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107303603A true CN107303603A (en) | 2017-10-31 |
| CN107303603B CN107303603B (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611177022.0A Active CN107303603B (en) | 2016-04-20 | 2016-12-19 | Water gap |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6546148B2 (en) |
| KR (1) | KR20170119917A (en) |
| CN (1) | CN107303603B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277861A (en) * | 2021-05-18 | 2021-08-20 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102083536B1 (en) * | 2017-11-14 | 2020-03-02 | 주식회사 포스코 | Submerged nozzle and Method for treatment of molten steel |
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| JP2010069515A (en) * | 2008-09-19 | 2010-04-02 | Nippon Steel Corp | Continuous casting method for steel |
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| KR101597254B1 (en) * | 2014-10-31 | 2016-02-24 | 주식회사 포스코 | Submerged nozzle for continuous casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3015305B2 (en) * | 1996-10-29 | 2000-03-06 | 品川白煉瓦株式会社 | Nozzle for continuous casting of steel |
| JP3213699B2 (en) * | 1997-05-08 | 2001-10-02 | 品川白煉瓦株式会社 | Nozzle for continuous casting of steel |
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- 2016-04-20 KR KR1020160048197A patent/KR20170119917A/en active Search and Examination
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| JPH05228593A (en) * | 1992-02-24 | 1993-09-07 | Akechi Ceramics Kk | Nozzle for continuous casting of molten steel |
| JPH10146655A (en) * | 1996-11-18 | 1998-06-02 | Shinagawa Refract Co Ltd | Nozzle for continuously casting steel |
| US6537486B1 (en) * | 2000-03-17 | 2003-03-25 | Yesuvius Crucible Company | Anti-buildup liner |
| KR20090076011A (en) * | 2008-01-07 | 2009-07-13 | 조선내화 주식회사 | Refractories of submerged entry nozzle for continuos casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113277861A (en) * | 2021-05-18 | 2021-08-20 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
| CN113277861B (en) * | 2021-05-18 | 2022-06-21 | 江苏泰瑞耐火有限公司 | Refractory material for submerged nozzle and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170119917A (en) | 2017-10-30 |
| JP2017192982A (en) | 2017-10-26 |
| CN107303603B (en) | 2020-09-04 |
| JP6546148B2 (en) | 2019-07-17 |
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